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This is a mistake I have made. The fuelling system works in closed loop and open loop. Only when the system is working in closed loop is the O2 sensor used. So the ecu needs help with what it needs to do when in open loop situations, this is where the tuner or re-map does its job.
Thanks for the info. So tuners only change anything under acceleration and warm up? That's my understanding of vehicle open loop operation.
Last edited by Pianoman18; Apr 29, 2020 at 01:38 AM.
Hey yall, I bought some slip-ons for my 2017 iron 883. I did this because I dont have the cash to blow on a full exhaust, ac and tuner (stage 1). But I need louder sound (loud pipes save lives), because stock mufflers are too quiet!! They are 9 shorties though. My question is, will I hurt my motor or anything on my sporty by running these and not getting a tuner?
I was told from the dealership when I brought my new 2017 / 1200 custom from, Is that only the 2016s ECM has the bandwidth to adjust for either slip ons or air filter changes but NOT BOTH.
The 17s ECM is buttoned down so tight that any intake or exhaust changes will need the ECM to be re calibrated.
And just time see if true , When I put my rush 3 slip ons with the 1.5 baffle tubes on I took it for a quick ride around the block.It wouldnt run for ****.
Enter the power vision from Fuelmoto 🤘flash the ECM and an auto tune Runs great.
Thanks for the info. So tuners only change anything under acceleration and warm up? That's my understanding of vehicle open loop operation.
There are many tables used for lookup by the ecm to make the decisions for how much fuel to inject after it has taken readings from the sensors on the engine and bike in open loop and closed loop.
To be sure you would have to compare each table from the fuel tuners map to the HD map to see what has been changed. I don't know what the changes are but can say the amount of petrol being injected will have increased everywhere to compensate for the increase in air intake.
Also saw something from another thread. With this short slip on set up, would I benefit purchasing the XL-VIED? Again, Im sure I sound like a newb which I am, but this seems better to me than buying a $400 tuner. From what I understand, this is just a plug in fuel management device that stays on your bike?
yes they would help to at least bring it back to how it runs with the stock exhaust now once you put those shorties on there, of course they give a one step change to the fueling and will help for now but at some point you will want more control of the fuel and you will end up buying the expensive controller any way so really its the smarter choice to buy it now if funds permit.
Id put them on and try it, if it runs rough and hot then make the decision on the short term or long term fueling solution, who knows it might run just fine with them and you can worry about the controller later when you do the AC.
There are many tables used for lookup by the ecm to make the decisions for how much fuel to inject after it has taken readings from the sensors on the engine and bike in open loop and closed loop.
To be sure you would have to compare each table from the fuel tuners map to the HD map to see what has been changed. I don't know what the changes are but can say the amount of petrol being injected will have increased everywhere to compensate for the increase in air intake.
Would it be fair to say/assume that using a tuner will decrease mpg as it adds fuel to the a/f ratio? The marketing hype from vehicle tuners is always 'increased' mileage, along with power, better sex life, hair grows back, and six pack abs appear overnight.
That is a difficult question to answer. With a better bang and more push you might see an increase in mpg. Going too far rich and mpg will suffer. Very important to optimise the tune.
Any experience with Screamin' Eagle or FP3 in regards to mileage? It's odd that there aren't many threads on these. Again, in the auto world, there's a lot more information on tuners. Here, it's "yeah, I have a Stage 1." End of story.
yes they would help to at least bring it back to how it runs with the stock exhaust now once you put those shorties on there, of course they give a one step change to the fueling and will help for now but at some point you will want more control of the fuel and you will end up buying the expensive controller any way so really its the smarter choice to buy it now if funds permit.
Id put them on and try it, if it runs rough and hot then make the decision on the short term or long term fueling solution, who knows it might run just fine with them and you can worry about the controller later when you do the AC.
gotcha, thanks for the input. I think Im just going to install the shorties and see how it runs. As for the funds, I dont have the flow to purchase the $300-$400 tuner that yall suggest. Id love it but cant afford that at the moment. Hoping these shorties work okay for the time being and dont hurt my motor
Would it be fair to say/assume that using a tuner will decrease mpg as it adds fuel to the a/f ratio? The marketing hype from vehicle tuners is always 'increased' mileage, along with power, better sex life, hair grows back, and six pack abs appear overnight.
I believe with my pipes, AC and tuner the gas mileage did go up...however the extra power, driveability and awesome sound has prevented me from riding it in a safe and responsible manner so my mileage is about the same, I just get there faster and have a lot more fun on the way.
I was told from the dealership when I brought my new 2017 / 1200 custom from, Is that only the 2016s ECM has the bandwidth to adjust for either slip ons or air filter changes but NOT BOTH.
The 17s ECM is buttoned down so tight that any intake or exhaust changes will need the ECM to be re calibrated.
And just time see if true , When I put my rush 3 slip ons with the 1.5 baffle tubes on I took it for a quick ride around the block.It wouldnt run for ****.
Enter the power vision from Fuelmoto 🤘flash the ECM and an auto tune Runs great.
Wiz 🍻
thanks man. For a couple days I completely took of my stock mufflers and was running the straight pipes. It was not running rough, but I noticed a slight loss in low end torque and mpg, which doesnt really bother me. But it might have ran slightly hotter? But idk, that was just a guess on the temp since I really had no way to test that fact. All I want is louder pipes, dont care about performance unless it affects the health of my motor in a major way. But from running straight pipes, I believe the shorties may work?? Ugh.. idk
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